REVDEP: config and note tweaks

Author: HenrikBengtsson

revdep/notes.md

@@ -45,25 +45,70 @@ their examples or tests require a working internet connection:
 * tableschema.r
 * tsfeatures
 
+
+### Packages that fail due to spotty internet downloads
+
+* pgxRpi
+
+
+
 ### Packages that fail if tested in parallel
 
 The following packages will fail when tested in parallel, because they
 compete with themselves for resources.  For example, several Bioconductor
 package assumes their BiocFileCache folder is empty, or no other R
 processes are writing to it at the same time.
 
-* ...
+Workaround is to clear file caches and check one package at the time;
+
+```sh
+rm -rf ~/.cache/R/
+R_REVDEPCHECK_NUM_WORKERS=1 revdep/run.R
+```
+
+
+
+
+### More 'multisession' workers than connectes
+
+Also, the below packages fail on hosts with many CPUs, because
+they use `availableCores()` in their vignettes, which falls back
+to `detectCores() when built via `R CMD check`.
+
+The workaround is to check with:
+
+```
+R_PARALLELLY_AVAILABLECORES_MAX=96 revdep/run.R
+```
 
-Also, the following packages fail on hosts with many CPUs, because
-they use detectCores() or more workers than there are connections:
+Note that this will be automatically limited to two (2) in
+**parallelly** (>= 1.46.0).
+
+Problematic packages:
 
 * ale
 * dar
-* fmeffects
-* FracFixR
 * gtfs2emis
 * gtfs2gps
 * signeR
 * simIDM
 * uci
 
+
+### Uses `detectCores()`
+
+The following packages uses 'multisession' and defaults to
+`parallel::detectCores()` workers. This fails on machines with > 125
+CPU cores. 
+
+The workaround is to check these package on a machine with fewer cores
+and setting R option 'parallelly.maxWorkers.localhost=c(100,100)' as;
+
+```sh
+R_PARALLELLY_MAXWORKERS_LOCALHOST="100,100" revdep/run.R
+```
+
+Problematic packages:
+
+* fmeffects
+* FracFixR

revdep/revdepcheck.Renviron

@@ -5,5 +5,10 @@ TAR_SKIP_CLUSTERMQ=${TAR_SKIP_CLUSTERMQ-true}
 ## Allow for at least two workers
 R_PARALLELLY_AVAILABLECORES_FALLBACK=2
 
+## Allow for at most 32 cores
+## Needed for parallelly (< 1.46.0), which will return
+## detectCores() when check vignettes
+R_PARALLELLY_AVAILABLECORES_MAX=32
+
 ## Turn on more checks
 #NOT_CRAN=true